نتایج جستجو برای: magnetic polymer particles

تعداد نتایج: 570798  

2014
Joseph J. Richardson Mattias Björnmalm Sylvia T. Gunawan Junling Guo Kang Liang Blaise Tardy Shota Sekiguchi Ka Fung Noi Jiwei Cui Hirotaka Ejima Frank Caruso

We report the preparation of polymer particles via convective polymer assembly (CPA). Convection is used to move polymer solutions and cargo through an agarose gel that contains immobilized template particles. This method both coats and washes the particles in a process that is amenable to automation, and does not depend on passive diffusion or electrical currents, thus facilitating incorporati...

1999
Kunio Furusawa

Electrokinetic behavior in synthetic process of composite particles have been analysed under the different combination systems. Firstly, the heterocoagulation process of amphoteric polymer latices on spherical silica was investigated as a function of z-potential of component particles, particle size ratio and of electrolyte in the medium. On the basis of these data, subsequent experiments to pr...

2005
Yulu Wang Robert Pfeffer Rajesh Dave Robert Enick

Coating and encapsulation of fine particles with polymer using a supercritical antisolvent (SAS) coating process was investigated in this research. Synthesized submicron silica particles were used as host particles and poly(lactide-co-glycolide) (PLGA), a biodegradable polymer used for controlled release of drugs, was chosen as the coating material. In the SAS coating process a suspension of si...

2006
Suzanne M. Barber Philip J. Costanzo

Rarely in Nature are single molecule interactions used for cell adhesion. Rather, several different types of molecules or structures interact in concert to build effective adhesion. We are developing a biosensor that can probe the range of interactions from the single molecule level to the ensemble average of multiple interactions. To achieve this goal we have harnessed specificity to effect pr...

Journal: :Journal of colloid and interface science 2012
Thomas M Ruhland Paul M Reichstein Alexander P Majewski Andreas Walther Axel H E Müller

We present the preparation and the characterization of the solution behavior and functional properties of superparamagnetic and/or fluorescent, thermo-responsive inorganic/organic hybrid particles with an intermediate protective silica shell and a smart polymer corona. These well-defined multifunctional nanogels were prepared via two consecutive encapsulation processes of superparamagnetic Fe(2...

2008
Prachi Thareja Sachin S. Velankar

Particles that are partially wetted by oil and water are known to adsorb at oil/water interfaces. By the same mechanism, particles that are partially wetted by two immiscible polymers should adsorb at the interface between those two polymers. However, since chemical differences between immiscible polymers are relatively modest, particle adsorption at polymer/polymer interfaces may be expected t...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2008
Andriy Shkilnyy Alwin Friedrich Brigitte Tiersch Stefanie Schöne Mabya Fechner Joachim Koetz Carl-Wilhelm Schläpfer Andreas Taubert

The current paper shows that poly(ethylene imine) (PEI) is an efficient template for the fabrication of spherical calcium phosphate (CaP)/polymer hybrid particles at pH values above 8. The polymer forms spherical entities, which contain one or a few CaP particles with diameters of ca. 6 nm. The samples contain up to 20 wt % polymer, which appears to be wrapped around the small CaP particles. Th...

Journal: :iranian journal of public health 0
zahra panjali ali akbar asgharinezhad homeira ebrahimzadeh niloofar jalilian rasoul yarahmadi seyed jamaleddin shahtaheri

background: the analysis of heavy metals at trace level is one of the main toxicologists concern, due to their vital rules in human`s life. cadmium is one of these toxic heavy metals, which released to the environment from various industries. methods: in order to determine cd (ii) ions in various matrices magnetic ion-imprinted polymer (iip) method has been developed and applied. this nano-sorb...

Journal: :international journal of nanoscience and nanotechnology 2015
e. ghasemi m. ghahari

in this research controlled coating of magnetite (fe3o4) nanoparticles with sio2 was investigated. the fe3o4 nanoparticles were synthesized via chemical co-precipitation and then coated by silica according to stober method. effects of tetra ethyl ortho silicate (teos) concentration and ethanol to teos on the coating thickness were investigated. x-ray powder diffraction, fourier transform infrar...

Journal: :Physical review letters 2004
Renaud Toussaint Geir Helgesen Eirik G Flekkøy

Nonmagnetic particles in a carrier ferrofluid acquire an effective dipolar moment when placed in an external magnetic field. This fact leads them to form chains that will roughen due to Brownian motion when the magnetic field is decreased. We study this process through experiments, theory and simulations, three methods that agree on the scaling behavior over 5 orders of magnitude. The rms width...

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